Cisco UCS Director isEnableRestKeyAccessCheckForUser Authentication Bypass Vulnerability

April 16th, 2020
ZDI-20-540 ZDI-CAN-9559

CVE ID

CVE-2020-3243

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Cisco

Affected Products

UCS Director

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of Cisco UCS Director. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of the X-Cloupia-Request-Key field in requests. The issue results from the lack of proper validation of the user-supplied field prior to using it in authentication operations. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsd-mult-vulns-UNfpdW4E

Disclosure Timeline

  • 2019-12-20 - Vulnerability reported to vendor
  • 2020-04-16 - Coordinated public release of advisory

Credit

Steven Seeley (mr_me) of Source Incite

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